| 天津大直沽晚第四纪沉积物红外释光测年及环境变迁年代学 |
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| 引用本文： | 赵华,卢演俦,张金起,王宏.天津大直沽晚第四纪沉积物红外释光测年及环境变迁年代学[J].地质科学,2002,37(2):174-183. |
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| 作者姓名： | 赵华 卢演俦 张金起 王宏 |
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| 作者单位： | 1. 中国科学院地质与地球物理研究所, 北京, 100029;2. 中国地震局地质研究所, 北京, 100029;3. 国土资源部天津地质矿产研究所, 天津, 300170 |
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| 基金项目： | 国家自然科学基金资助项目 (批准号 :4 0 0 0 2 0 1 3) |
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| 摘 要： | 对天津大直沽ZH2钻孔晚第四纪沉积物岩芯12个样品的红外释光(IRSL)测年及沉积物记录的环境变化研究结果表明:1)细颗粒(4～11μm)多测片的红外释光(IRSL)技术对水悬浮沉积物的年龄测定有着巨大的潜力,渤海湾西岸全新世环境变化的IRSL年代可与14C年代相对比;2)大直沽ZH2孔所在地未见晚更新世海侵,并在距今约30 ka至约10 ka期间处于沉积间断状态,距今9.5 ka开始发生海侵,距今5.1 ka发生海退,距今4.4 ka海水已退出ZH2孔所在地,距今2 ka左右已有人类活动.
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| 关 键 词： | 红外释光测年 水沉积物 环境变迁年代 天津 |
| 收稿时间： | 2000-12-06 |
| 修稿时间： | 2000年12月6日 |
IRSL DATING OF LATE QUATERNARY SEDIMENTS AND CHRONOLOGY OF ENVIRONMENTAL CHANGES AT DAZHIGU AREA, TIANJIN |
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| Zhao Hua,Lu Yanchou,Zhang Jinqi,Wang Hong.IRSL DATING OF LATE QUATERNARY SEDIMENTS AND CHRONOLOGY OF ENVIRONMENTAL CHANGES AT DAZHIGU AREA, TIANJIN[J].Chinese Journal of Geology,2002,37(2):174-183. |
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| Authors: | Zhao Hua Lu Yanchou Zhang Jinqi Wang Hong |
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| Institution: | 1. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029;2. Institute of Geology, Seismological Bureau of China, Beijing 100029;3. Tianjin Institute of Geology and Mineral Resources, Ministry of Land and Resources, Tianjin 300170 |
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| Abstract: | Twelve water-laid sediment samples collected from the ZH2 core of depth 30 5 m at Dazhigu (117° 14′ 10″ E, 39° 06′ 47″ N) in Tianjin city were dated by fine grain (4～11 μm) multiple aliquot IRSL analysis. An “Australian Slide Method” as a combining of additive dose and regeneration method (Prescott et al., 1993) was employed for equivalent dose (DE) determinations. The IRSL signals of the fine grain samples were all bleached with yellow lights for regeneration. The IRSL age estimates obtained from these samples were well consistent with sedimentary stratigraphy and good in agreement with 14C dates of the Holocene transgression and regression in the western coastal zone of the Bohai Sea. Therefore the fine grain multiple aliquot IRSL dating method has increasing advantage for age determination of water-laid sediments. Based on sediment sequences, sedimentary facies and IRSL dates of the ZH2 core, the time scale of the environmental changes in the Dazhigu area in the last about 50 ka B.P. would be outlined as follows. The Pleistocene transgression, which was widely occurred in west coastal zone of the Bohai Sea, did not reach at location of ZH2 core and there the alluvial and lacustrine sediments were deposited from 50 ka to 30 ka B.P. A break of deposition developed during the period from 30 ka to 10 ka B.P. The Holocene transgression might be occurred there at about 9.5 ka B.P., and regression began at about 5.1 ka B.P. Sea water has already retreated at about 4.4 ka B.P., and the human occupied there since about 2 ka B.P. |
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| Keywords: | IRSL dating Chronology of environment change Tianjin |
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